"Oleg Tkachenko [MVP]" wrote:

> Slava Sedov wrote:
> > need to effectively perform 2 sequential xslt transforms on some data 
> > ((xm1+xsl1)+xsl2) and can`t find a way to do it without intermediate 
> > transform intermediate xml to text - i use XslCompiledTransform with 
> > XPathDocument, is anyone know good way to pass result data after first 
> > xslt-transformation as source data for second xslt-transformation?
> 
> As XslCompiledTransform doesn't support XmlReader output, there is no 
> such easy way. The only way that doesn't incur reparsing is transforming 
> to XmlNodeWriter, which writes to XmlDocument. But then your next 
> transformation will deal with XmlDocument, which is slower than 
> XPathDocument.
> We (XML MVPs) are working on this problem.

it is very actual problem, temporary i will use StringBuilder and cached 
XPathDocument but must mark this part of code as "weak" and set "review date" 
for this problem, when MS going to solve it? .NET 2.0 or later?

> 
> Another solution is to avoid double stylesheets and instead combine them 
> into one (set mode for each template to distinguish them), then store 
> first transformation in a variable, convert it to a nodeset and run 
> second one.

i used it very long in SQLXML (without ASP.NET) - but it is not acceptable 
for current work (i must divide content, presentation and interaction into 
totally independent parts of code) maybe i need not only 2 sequential of 
transformations, what if i include PI stylesheet into resulting document? can 
Microsoft in this case provide support for "precompilied instant chained 
transformations"? :)

> 
> > p.s. also i am interesting about best practice to this scenario - i get 
> > xml1, then apply xslt1 to it and in result i get another xslt2 and then 
> > perform tranformation of xml2 using xslt2. I don`t understand why i need 
> > store intermediate results as strings instead of storing it as XPathDocument 
> > or at least XMLDocument.
> You don't have to. Transform to XmlWriter instead.

can you present any code example?

> 
> -- 
> Oleg Tkachenko [XML MVP, MCAD]
> http://www.xmllab.net
> http://blog.tkachenko.com
>